Description General description Native IgM from human plasma. Packaging 1 mg in Plastic ampoule Please refer to vial label for lot-specific concentration. Warning Toxicity: Standard Handling (A) Physical form In 200 mM NaCl, 50 mM Tris, pH 8.0. Preparation Note Prepared from plasma shown to be nonreactive for HBsAg and for antibodies to HCV, HBc, HIV-1, and HIV-2 by certified tests. Reconstitution Following initial thaw, aliquot and freeze (-20°C). Other Notes Contains both kappa and lambda light chains. Variables associated with assay conditions will dictate the proper working dilution.